Math question: Given the constant function f(x) = c, if c = 3, what is the value of f(7)?
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What is the component form of a unit vector in the opposite direction to vector v = i + 2j - 3k?
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What is the equation for an ellipse with its major axis parallel to the x-axis, center at (h, k), semi-major axis length a, and semi-minor axis length b?